Paging optimization method, apparatus, and system

ABSTRACT

Embodiments of the present invention, relating to the communications field, disclose a paging optimization method, apparatus, and system, so as to ensure that a terminal normally receives a paging message sent by a system. A specific solution carried by a core network node comprising determining channel loss information of a terminal according to an international mobile subscriber identity IMSI or a temporary mobile subscriber identity S-TMSI of the terminal; and sending a first paging message that carries the channel loss information to an access network node, wherein the first paging message is used to page the terminal. The present invention is used in a paging process.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/833,846, filed on Aug. 24, 2015, which is a continuation ofInternational Application No. PCT/CN2013/071953, filed on Feb. 27, 2013.All of the afore-mentioned patent applications are hereby incorporatedby reference in their entireties.

TECHNICAL FIELD

The present invention relates to the communications field, and inparticular, to a paging optimization method, apparatus, and system.

BACKGROUND

As communications technologies develop, the Internet of Things has beenwidely used in multiple fields such as smart grid, intelligenttransportation, government affairs, and smart household. Currently,low-cost machine type communications user equipment (MTC UE) has beenintroduced to a Long Term Evolution (LTE) network, with a view toenhancing or optimizing the LTE network and an air interface for the MTCUE. An important application of the MTC UE is a smart meter, which, forexample, can be used to automatically read metering information such aswater, electricity, and gas, and report the metering information to adata center. However, such a smart meter is generally installed in abasement of a house, or is isolated by a heavy metal housing. Therefore,in this case, a path loss between the MTC UE and an evolved NodeB(eNodeB) is more severe than a path loss between a common UE and theeNodeB. To ensure that the MTC UE can still normally communicate withthe eNodeB when the path loss between the MTC UE and the eNodeB issevere, an operator proposes enhancing coverage by 20 dB compared withan existing LTE network when an LTE network is providing a service forthe MTC UE.

In the existing LTE network, for a UE in an idle state, when the UE hasan incoming service, or for a UE in an idle state or a connected state,when a system message needs to be changed or an earthquake or tsunamiearly warning or commercial mobile alert service is required, thenetwork needs to page a corresponding UE. A paging process is usually asfollows: A mobility management entity (MME) that serves a UE sends apaging message to all eNodeBs in a tracking area; when receiving thepaging message sent by the MME, an eNodeB delivers the paging message toa UE in a management range of the eNodeB.

During implementation of the foregoing paging process, if the existingLTE system is used to provide a service for a UE that has a relativelysevere path loss with an eNodeB, for example, an MTC UE, coverage of theexisting LTE system needs to be enhanced. In this case, a paging messagewith enhanced coverage needs to be sent to the UE. If the UE is beingpaged still in an existing paging manner, the UE cannot normally receivea paging message of the system, which causes a paging failure.

SUMMARY

Embodiments of the present invention provide a paging optimizationmethod, apparatus, and system, so as to ensure that a terminal normallyreceives a paging message sent by a system.

To achieve the foregoing objective, the following technical solutionsare used in the embodiments of the present invention:

A first aspect of the present invention provides a paging optimizationmethod, including:

receiving a first paging message sent by a core network node, where thefirst paging message is used to page a terminal; and

sending control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal in response to thefirst paging message;

With reference to the first aspect, in a possible implementation manner,

the first paging message includes channel loss information of theterminal; or

before the sending control information with enhanced coverage and/or asecond paging message with enhanced coverage to the terminal in responseto the first paging message, the method further includes:

receiving channel loss information of the terminal sent by the corenetwork node.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, beforethe receiving a first paging message sent by a core network node, themethod further includes:

receiving channel loss information sent by the terminal; and

sending the channel loss information of the terminal to the core networknode.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, themethod further includes:

receiving an international mobile subscriber identity IMSI or atemporary mobile subscriber identity S-TMSI that is sent by theterminal, and receiving channel loss information sent by the terminal;or, receiving an IMSI or an S-TMSI of the terminal sent by the corenetwork node, and receiving channel loss information of the terminalsent by the core network node; or, receiving channel loss informationsent by the terminal and an S-TMSI of the terminal sent by the corenetwork node; and

storing the IMSI or the S-TMSI of the terminal associatively with thechannel loss information of the terminal.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, beforethe sending control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal in response to thefirst paging message, the method further includes:

determining, according to an IMSI or an S-TMSI of the terminal, that thechannel loss information of the terminal is stored.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thesending control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal in response to thefirst paging message includes:

determining a transmission parameter according to the channel lossinformation of the terminal; and

sending the control information with enhanced coverage and/or the secondpaging message with enhanced coverage to the terminal according to thetransmission parameter.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the first aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A second aspect of the present invention provides a paging optimizationmethod, including:

determining, according to an international mobile subscriber identityIMSI or a temporary mobile subscriber identity S-TMSI of a terminal,that channel loss information of the terminal is stored; and

sending a first paging message that carries the channel loss informationto an access network node, so that the access network node sends controlinformation with enhanced coverage and/or a second paging message withenhanced coverage to the terminal according to the first paging message;or,

sending a first paging message and the channel loss information of theterminal to the access network node, so that the access network nodesends control information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal according to the firstpaging message and the channel loss information of the terminal.

With reference to the second aspect, in a possible implementationmanner, the method further includes:

sending the IMSI or the S-TMSI of the terminal to the access networknode, and sending the channel loss information of the terminal to theaccess network node, so that the access network device stores the IMSIor the S-TMSI of the terminal associatively with the channel lossinformation of the terminal.

With reference to the second aspect and the foregoing possibleimplementation manner, in another possible implementation manner, beforethe determining, according to an international mobile subscriberidentity IMSI or a temporary mobile subscriber identity S-TMSI of aterminal, that channel loss information of the terminal is stored, themethod further includes:

receiving the channel loss information of the terminal; and

storing the channel loss information of the terminal associatively withthe IMSI or the S-TMSI of the terminal.

With reference to the second aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the second aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the second aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A third aspect of the present invention provides a paging optimizationmethod, including:

determining channel loss information between a terminal and an accessnetwork node;

sending the channel loss information to the access network node, sendingan international mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI to the access network node, and determining atransmission parameter according to the channel loss information; and

receiving, according to the transmission parameter, control informationwith enhanced coverage and/or a second paging message with enhancedcoverage that are/is sent by the access network node.

With reference to the third aspect, in a possible implementation manner,before the sending the channel loss information to the access networknode, sending an international mobile subscriber identity IMSI or atemporary mobile subscriber identity S-TMSI to the access network node,and determining a transmission parameter according to the channel lossinformation, the method further includes:

determining that the channel loss information meets a set condition,where the set condition includes that a value of the channel loss isgreater than or equal to a set threshold.

With reference to the third aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the third aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the third aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes the value of the channel loss, or arange of the value of the channel loss, or a range index of the value ofthe channel loss.

With reference to the third aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A fourth aspect of the present invention provides an access networknode, including:

a first receiving unit, configured to receive a first paging messagesent by a core network node, where the first paging message is used topage a terminal; and

a first sending unit, configured to send control information withenhanced coverage and/or a second paging message with enhanced coverageto the terminal in response to the first paging message.

With reference to the fourth aspect, in a possible implementationmanner,

the first paging message includes channel loss information of theterminal; or the access network node further includes:

a second receiving unit, configured to, before the first sending unitsends control information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal in response to the firstpaging message, receive channel loss information of the terminal sent bythe core network node.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, theaccess network node further includes:

a third receiving unit, configured to, before the first receiving unitreceives the first paging message sent by the core network node, receivechannel loss information sent by the terminal; and

a second sending unit, configured to send the channel loss informationof the terminal received by the third receiving unit to the core networknode.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, theaccess network node further includes:

a fourth receiving unit, configured to receive an international mobilesubscriber identity IMSI or a temporary mobile subscriber identityS-TMSI that is sent by the terminal, and receive channel lossinformation sent by the terminal; or, receive an IMSI or an S-TMSI ofthe terminal sent by the core network node, and receive channel lossinformation of the terminal sent by the core network node; or, receivechannel loss information sent by the terminal and an S-TMSI of theterminal sent by the core network node; and

a storage unit, configured to store, associatively with the channel lossinformation of the terminal, the IMSI or the S-TMSI of the terminalreceived by the fourth receiving unit.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, theaccess network node further includes:

a determining unit, configured to, before the first sending unit sendscontrol information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal in response to the firstpaging message, determine, according to an IMSI or an S-TMSI of theterminal, that the channel loss information of the terminal is stored.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thefirst sending unit includes:

a determining module, configured to determine a transmission parameteraccording to the channel loss information of the terminal; and

a sending module, configured to send the control information withenhanced coverage and/or the second paging message with enhancedcoverage to the terminal according to the transmission parameterdetermined by the determining module.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the fourth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A fifth aspect of the present invention provides a core network node,including:

a determining unit, configured to determine, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of a terminal, that channel loss informationof the terminal is stored; and

a first sending unit, configured to send a first paging message thatcarries the channel loss information to an access network node, so thatthe access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalaccording to the first paging message; or,

a second sending unit, configured to send a first paging message and thechannel loss information of the terminal to the access network node, sothat the access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal according to the first paging message and the channel lossinformation of the terminal.

With reference to the fifth aspect, in a possible implementation manner,the core network node further includes:

a third sending unit, configured to send the IMSI or the S-TMSI of theterminal to the access network node, and send the channel lossinformation of the terminal to the access network node, so that theaccess network device stores the IMSI or the S-TMSI of the terminalassociatively with the channel loss information of the terminal.

With reference to the fifth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecore network node further includes:

a receiving unit, configured to receive the channel loss information ofthe terminal before the determining unit determines, according to theinternational mobile subscriber identity IMSI or the temporary mobilesubscriber identity S-TMSI of the terminal, that the channel lossinformation of the terminal is stored; and

a storage unit, configured to store, associatively with the IMSI or theS-TMSI of the terminal, the channel loss information of the terminalreceived by the receiving unit.

With reference to the fifth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the fifth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the fifth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A sixth aspect of the present invention provides a terminal, including:

a first determining unit, configured to determine channel lossinformation between the terminal and an access network node;

a sending and determining unit, configured to send the channel lossinformation to the access network node, send an international mobilesubscriber identity IMSI or a temporary mobile subscriber identityS-TMSI to the access network node, and determine a transmissionparameter according to the channel loss information; and

a receiving unit, configured to receive, according to the transmissionparameter determined by the sending and determining unit, controlinformation with enhanced coverage and/or a second paging message withenhanced coverage that are/is sent by the access network node.

With reference to the sixth aspect, in a possible implementation manner,the terminal further includes:

a second determining unit, configured to, before the sending anddetermining unit sends the channel loss information to the accessnetwork node, sends the international mobile subscriber identity IMSI orthe temporary mobile subscriber identity S-TMSI to the access networknode, and determines the transmission parameter according to the channelloss information, determine that the channel loss information meets aset condition, where the set condition includes that a value of thechannel loss is greater than or equal to a set threshold.

With reference to the sixth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the sixth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the sixth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes the value of the channel loss, or arange of the value of the channel loss, or a range index of the value ofthe channel loss.

With reference to the sixth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A seventh aspect of the present invention provides an access networknode, including: at least one processor, a receiver, and a transmitter,where:

the receiver is configured to receive a first paging message sent by acore network node, where the first paging message is used to page aterminal;

the processor is configured to process the first paging message receivedby the receiver, and trigger the transmitter to respond to the firstpaging message; and

the transmitter is configured to send control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal in response to the first paging message.

With reference to the seventh aspect, in a first possible implementationmanner,

the first paging message includes channel loss information of theterminal; or

the receiver is further configured to, before the transmitter sendscontrol information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal in response to the firstpaging message, receive channel loss information of the terminal sent bythe core network node.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner,

the receiver is further configured to, before receiving the first pagingmessage sent by the core network node, receive channel loss informationsent by the terminal; and

the transmitter is further configured to send the channel lossinformation of the terminal to the core network node.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner, theaccess network node further includes a memory, where:

the receiver is further configured to receive an international mobilesubscriber identity IMSI or a temporary mobile subscriber identityS-TMSI that is sent by the terminal, and receive channel lossinformation sent by the terminal; or, receive an IMSI or an S-TMSI ofthe terminal sent by the core network node, and receive channel lossinformation of the terminal sent by the core network node; or, receivechannel loss information sent by the terminal and an S-TMSI of theterminal sent by the core network node; and

the memory is configured to store the IMSI or the S-TMSI of the terminalassociatively with the channel loss information of the terminal.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner,

the processor is further configured to, before processing the firstpaging message received by the receiver, and triggering the transmitterto respond to the first paging message, determine, according to an IMSIor an S-TMSI of the terminal, that the channel loss information of theterminal is stored.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner,

the processor is further configured to determine a transmissionparameter according to the channel loss information of the terminal; and

the transmitter is further configured to send the control informationwith enhanced coverage and/or the second paging message with enhancedcoverage to the terminal according to the transmission parameter.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the seventh aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

An eighth aspect of the present invention provides a core network node,including: at least one processor and a transmitter, where:

the processor is configured to determine, according to an internationalmobile subscriber identity IMSI or a temporary mobile subscriberidentity S-TMSI of a terminal, that channel loss information of theterminal is stored; and

the transmitter is configured to send a first paging message thatcarries the channel loss information to an access network node, so thatthe access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalaccording to the first paging message; or,

the transmitter is further configured to send a first paging message andthe channel loss information of the terminal to the access network node,so that the access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal according to the first paging message and the channel lossinformation of the terminal.

With reference to the eighth aspect, in a possible implementationmanner,

the transmitter is further configured to send the IMSI or the S-TMSI ofthe terminal to the access network node, and send the channel lossinformation of the terminal to the access network node, so that theaccess network node stores the IMSI or the S-TMSI of the terminalassociatively with the channel loss information of the terminal.

With reference to the eighth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecore network node further includes a receiver and a memory, where:

the receiver is configured to, before the determining, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of a terminal, that channel loss informationof the terminal is stored, receive the channel loss information of theterminal; and

the memory is configured to store the channel loss information of theterminal associatively with the IMSI or the S-TMSI of the terminal.

With reference to the eighth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the eighth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes a value of a channel loss, or a rangeof a value of a channel loss, or a range index of a value of a channelloss.

With reference to the eighth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A ninth aspect of the present invention provides a terminal, including:at least one processor, a receiver, and a transmitter, where:

the processor is configured to determine channel loss informationbetween the terminal and an access network node;

the processor is further configured to trigger the transmitter to: sendthe channel loss information to the access network node, and send aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI to the access network node; and is furtherconfigured to determine a transmission parameter according to thechannel loss information; and

the receiver is configured to receive, according to the transmissionparameter, control information with enhanced coverage and/or a secondpaging message with enhanced coverage that are/is sent by the accessnetwork node.

With reference to the ninth aspect, in a possible implementation manner,

the processor is further configured to, before the sending the channelloss information to the access network node, and sending aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI to the access network node, determine thatthe channel loss information meets a set condition, where the setcondition includes that a value of the channel loss is greater than orequal to a set threshold.

With reference to the ninth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thecontrol information with enhanced coverage meets at least one of thefollowing conditions: more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

With reference to the ninth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thetransmission parameter includes at least one of the following: a startframe number, a start subframe number, a start timeslot number, a startsymbol number, a number of the first resource block RB, a number of thefirst subcarrier, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers, a quantity of repeated times, a spreadingfactor, a spread spectrum sequence index, a size of transmission timeinterval bundling TTI bundling, an aggregation level, powerconfiguration, a modulation and coding scheme, a cycle, a paging framePF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

With reference to the ninth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss information includes the value of the channel loss, or arange of the value of the channel loss, or a range index of the value ofthe channel loss.

With reference to the ninth aspect and the foregoing possibleimplementation manner, in another possible implementation manner, thechannel loss includes at least one of the following: reference signalreceived power RSRP, reference signal received quality RSRQ, a pathloss, and a channel quality indication CQI.

A tenth aspect of the present invention provides a paging optimizationsystem, including: an access network node, a core network node, and aterminal, where:

the access network node is configured to receive a first paging messagesent by the core network node, where the first paging message is used topage the terminal; and send control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminal inresponse to the first paging message;

the core network node is configured to determine, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of the terminal, that channel lossinformation of the terminal is stored; and send the first paging messagethat carries the channel loss information to the access network node, sothat the access network node sends the control information with enhancedcoverage and/or the second paging message with enhanced coverage to theterminal according to the first paging message; or, send the firstpaging message and the channel loss information of the terminal to theaccess network node, so that the access network node sends the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage to the terminal according to the first paging messageand the channel loss information of the terminal; and

the terminal is configured to send the channel loss information to theaccess network node, and send the international mobile subscriberidentity IMSI or the temporary mobile subscriber identity S-TMSI to theaccess network node; determine a transmission parameter according to thechannel loss information; and receive, according to the transmissionparameter, the control information with enhanced coverage and/or thesecond paging message with enhanced coverage that are/is sent by theaccess network node.

According to the paging optimization method, apparatus, and systemprovided in the embodiments of the present invention, when a terminalneeds to be paged, a core network node sends a first paging message toan access network node; after receiving the first paging message sent bythe core network node, the access network node sends control informationwith enhanced coverage and/or a second paging message with enhancedcoverage to the terminal that needs to be paged. This effectivelyensures that, in a case in which a channel loss between the terminal andthe access network node is severe, the terminal can still normallyreceive a paging message sent by a system.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention or in the prior art more clearly, the following brieflyintroduces the accompanying drawings required for describing theembodiments or the prior art. Apparently, the accompanying drawings inthe following description show merely some embodiments of the presentinvention, and a person of ordinary skill in the art may still deriveother drawings from these accompanying drawings without creativeefforts.

FIG. 1 is a flowchart of a paging optimization method according to anembodiment of the present invention;

FIG. 2 is a flowchart of a paging optimization method according toanother embodiment of the present invention;

FIG. 3 is a flowchart of another paging optimization method according toanother embodiment of the present invention;

FIG. 4 is a flowchart of another paging optimization method according toanother embodiment of the present invention;

FIG. 5 is a flowchart of another paging optimization method according toanother embodiment of the present invention;

FIG. 6 is a schematic compositional diagram of an access network nodeaccording to another embodiment of the present invention;

FIG. 7 is a schematic compositional diagram of a core network nodeaccording to another embodiment of the present invention;

FIG. 8 is a schematic compositional diagram of another core network nodeaccording to another embodiment of the present invention;

FIG. 9 is a schematic compositional diagram of a terminal according toanother embodiment of the present invention;

FIG. 10 is a schematic compositional diagram of another access networknode according to another embodiment of the present invention;

FIG. 11 is a schematic compositional diagram of another core networknode according to another embodiment of the present invention;

FIG. 12 is a schematic compositional diagram of another terminalaccording to another embodiment of the present invention; and

FIG. 13 is a schematic compositional diagram of a paging optimizationsystem according to another embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The following clearly and completely describes the technical solutionsin the embodiments of the present invention with reference to theaccompanying drawings in the embodiments of the present invention.Apparently, the described embodiments are merely a part rather than allof the embodiments of the present invention. All other embodimentsobtained by a person of ordinary skill in the art based on theembodiments of the present invention without creative efforts shall fallwithin the protection scope of the present invention.

It should be noted that a paging optimization method provided in theembodiments of the present invention may be applied to variouscommunications systems, for example, current 2G and 3G communicationssystems and a next-generation communications system, for example, aGlobal System for Mobile Communications (GSM), a Code Division MultipleAccess (CDMA) system, a Time Division Multiple Access (TDMA) system, aWideband Code Division Multiple Access (WCDMA) system, a FrequencyDivision Multiple Access (FDMA) system, an Orthogonal Frequency-DivisionMultiple Access (OFDMA) system, a single-carrier FDMA (SC-FDMA) system,a General Packet Radio Service (GPRS) system, a Universal MobileTelecommunication System (UMTS), an LTE system, and other communicationssystems. For example, when the paging optimization method is applied tothe UMTS system, the core network node in the embodiments of the presentinvention may be a serving GPRS support node (Serving GPRS SUPPORT NODE,SGSN), and the access network node may be a radio network controller(RNC), or the access network node may be another radio access networkdevice; when the paging optimization method is applied to the LTEsystem, the core network node in the embodiments of the presentinvention may be an MME, and the access network node may be an eNodeB.For ease of understanding by a person skilled in the art, the LTE systemis used as an example to describe the embodiments of the presentinvention.

It should be noted that, in the embodiments of the present invention, aterminal may be a common UE, or may be an MTC UE, which is not limitedin the embodiments of the present invention.

An embodiment of the present invention provides a paging optimizationmethod. As shown in FIG. 1, the method may include:

101. An access network node receives a first paging message sent by acore network node.

When a network needs to page a terminal, a core network node that servesthe terminal may initiate a paging process to all access network nodesin a tracking area, so that an access network node can receive a firstpaging message sent by the core network node. The first paging messageis used to page the terminal.

102. The access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to aterminal in response to the first paging message.

The first paging message sent by the core network node to the accessnetwork node may carry a terminal identity index value of the terminalthat needs to be paged and an international mobile subscriber identity(IMSI) of the terminal, or a terminal identity index value of theterminal that needs to be paged and a temporary mobile subscriberidentity (S-temporary mobile subscriber identity, S-TMSI). In this case,to enable the terminal to normally receive, in a case in which a channelloss between the terminal and the access network node is severe, apaging message sent by a system, after receiving the first pagingmessage sent by the core network code, the access network node mayacquire a paging frame (PF) and/or a paging occasion (PO) according tothe terminal identity index value carried in the first paging message,and send, over the paging frame and at the paging occasion, the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage to the terminal that needs to be paged.

It should be noted that, the control information with enhanced coverageand/or the second paging message with enhanced coverage are/is controlinformation and/or a paging message that are/is sent by the accessnetwork node to a terminal when a channel loss between the terminal andthe access network node is severe, and can enhance coverage of controlinformation and/or a paging message in an existing system, so as tocompensate for the severe channel loss between the terminal and theaccess network node and enable the terminal to normally receive a pagingmessage sent by the system. A specific value of enhanced coverage thatcan be provided by the control information with enhanced coverage and/orthe second paging message with enhanced coverage may be calculatedaccording to a worst channel loss status between all terminals and theaccess network node, or different values of enhanced coverage may becalculated according to different channel loss statuses. The embodimentof the present invention does not limit a value of enhanced coverage,and a unit of the foregoing value of enhanced coverage may be dB.

According to the paging optimization method provided in the embodimentof the present invention, when a terminal needs to be paged, a corenetwork node sends a first paging message to an access network node;after receiving the first paging message sent by the core network node,the access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

Another embodiment of the present invention provides a pagingoptimization method. As shown in FIG. 2, the method may include:

201. Determine, according to an IMSI or an S-TMSI of a terminal, thatchannel loss information of the terminal is stored.

A core network node may determine, according to an IMSI or an S-TMSI ofthe terminal, whether the channel loss information of the terminal isstored, and when determining that the channel loss information of theterminal is stored, perform the following step 202. The channel lossinformation may be received and stored in advance by the core networknode.

202. Send a first paging message that carries the channel lossinformation to an access network node, so that the access network nodesends control information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal according to the firstpaging message; or, send a first paging message and the channel lossinformation of the terminal to an access network node, so that theaccess network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalaccording to the first paging message and the channel loss informationof the terminal.

After determining that the channel loss information of the terminal isstored, the core network node can send the first paging message thatcarries the channel loss information of the terminal to the accessnetwork node, so that the access network node sends the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage to the terminal according to the first paging message;or notify the access network node of the channel loss information byusing a dedicated message at a protocol layer of the access network nodeand the core network node, and send the first paging message to theaccess network node in a form of sending a paging message, so that afterreceiving the channel loss information of the terminal and the firstpaging message, the access network node determines a transmissionparameter, and sends, according to the transmission parameter, thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage to the terminal that needs to be paged.

According to the paging optimization method provided in the embodimentof the present invention, when a terminal needs to be paged, a corenetwork node sends a first paging message to an access network node;after receiving the first paging message sent by the core network node,the access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

Another embodiment of the present invention provides a pagingoptimization method. As shown in FIG. 3, the method may include:

301. A terminal determines channel loss information between the terminaland an access network node.

The channel loss information may include at least one of the following:reference signal received power (RSRP), reference signal receivedquality (RSRQ), a path loss, and a channel quality indication (CQI),where the path loss is a path loss between the terminal and an eNodeB.The channel loss information that is between the terminal and the accessnetwork node and determined by the terminal may be a value of a channelloss, or may be a range of a value of a channel loss, or may be a rangeindex of a value of a channel loss. Specifically, the value of thechannel loss may be obtained by using the following method: The terminalmay perform measurement so as to obtain values of the RSRP, the RSRQ,and the CQI, and the value of the path loss may be obtained by theterminal by calculating a difference between power of a downlinkcell-specific reference signal (CRS) sent by the eNodeB and the value ofthe RSRP, where the terminal can obtain, by using system informationblock type 2 (SIB2), the power used by the eNodeB to send the downlinkCRS. The eNodeB, a system, or another network-side entity may divide thevalue of the channel loss between the terminal and the eNodeB into Nranges, where N is a positive integer; and then the eNodeB sends, to theterminal, division information that the value of the channel loss isdivided into N ranges. By using one or more types of the followingmessages: a common radio resource control (RRC) message, a dedicated RRCmessage, a media access control (MAC) control element (CE) message, anda physical-layer message that are sent by the eNodeB and received by theterminal, the terminal can obtain the division information that thevalue of the channel loss is divided into N ranges. Specifically, thedivision information includes a parameter used to indicate a value of Nand/or a threshold parameter used to determine N ranges, where theparameter used to indicate the value of N or the threshold parameterused to determine the N ranges may also be a fixed value that is agreedupon in advance and preset. The terminal, the eNodeB, or the anothernetwork-side entity may also perform index numbering on the N ranges ina manner that is agreed upon in advance, for example, a number rangesfrom range index 1 of a value of a channel loss to range index N of avalue of a channel loss. For example, if the value of the channel lossis divided into three ranges, that is, N=3, the three ranges may berespectively as follows: range index 1 of a value of a channel loss:channel loss <=x1 dB; range index 2 of a value of a channel loss: x1 dB<channel loss <=x2 dB; and range index 3 of a value of a channel loss:channel loss >x2 dB. In this case, the parameter that indicates thevalue of N and is included in the division information that can be sentby the eNodeB to the terminal may be 3, and/or threshold parameters usedto determine three ranges are x1 and x2; the foregoing parameters 3, x1,and x2 may also be preset, so that the eNodeB does not need to includethese two parameters in the division information. Alternatively, theterminal may determine the N ranges of the value of the channel lossaccording to a rule that is agreed upon in advance with the eNodeB orthe another network-side entity, and the rule that is agreed upon inadvance may be a range index of a value of a channel loss, that is,x=fun(channel loss), where fun( ) indicates a function. Alternatively,the terminal may determine the N ranges of the value of the channel lossaccording to an agreement with the system, the eNodeB, or the anothernetwork-side entity. In this way, the terminal may determine a range ofthe value of the channel loss of the terminal according to the N rangesand the value of the channel loss of the terminal that is obtainedthrough measurement, or may determine a range index of the value of thechannel loss.

302. The terminal sends the channel loss information to the accessnetwork node, sends an IMSI or an S-TMSI to the access network node, anddetermines a transmission parameter according to the channel lossinformation.

When a channel loss between the terminal and the access network node issevere, the terminal may send the determined channel loss information ofthe terminal to the access network node, and send the IMSI or the S-TMSIof the terminal to the access network node, so that when the terminalneeds to be paged, the access network node sends control informationwith enhanced coverage and/or a second paging message with enhancedcoverage to the terminal. In addition, to ensure that the terminal canreceive the control information with enhanced coverage and/or the secondpaging message with enhanced coverage that are/is sent by the accessnetwork node, the terminal needs to determine the transmission parameteraccording to the channel loss information. Specifically, same as theaccess network node, the terminal may determine the transmissionparameter according to the channel loss information. For details,reference may be made to a description in step 406. Alternatively,before the terminal determines the transmission parameter according tothe channel loss information, the access network node may determine agroup of corresponding transmission parameters according to differentchannel loss information, and send the determined group of transmissionparameters and a correspondence between the group of transmissionparameters and the channel loss information to the terminal by using anRRC common message, so that the terminal can select a correspondingtransmission parameter from the group of transmission parametersaccording to the channel loss information of the terminal.

303. Receive, according to the transmission parameter, controlinformation with enhanced coverage and/or a second paging message withenhanced coverage that are/is sent by the access network node.

After determining the transmission parameter according to the channelloss information, the terminal may receive, according to thetransmission parameter, the control information with enhanced coverageand/or the second paging message with enhanced coverage that are/is sentby the access network node.

According to the paging optimization method provided in the embodimentof the present invention, a terminal sends channel loss information toan access network node, and sends an IMSI or an S-TMSI to the accessnetwork node, so that when the terminal is being paged, the accessnetwork node can send control information with enhanced coverage and/ora second paging message with enhanced coverage to the terminal, and theterminal can receive, according to a transmission parameter that isdetermined according to the channel loss information, the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage that are/is sent by the access network node. Thiseffectively ensures that, in a case in which a channel loss between theterminal and the access network node is severe, the terminal can stillnormally receive a paging message sent by a network-side device.

Another embodiment of the present invention provides a pagingoptimization method. As shown in FIG. 4, the method may include:

401. An access network node receives channel loss information sent by aterminal.

For a terminal in an idle state, when the terminal has a service, or fora terminal in an idle state and a terminal in a connected state, when asystem message needs to be changed or an earthquake or tsunami earlywarning or commercial mobile alert service is required, a network needsto page a corresponding UE. To ensure that in a case in which a channelloss between the terminal and an eNodeB is severe, the terminal canstill normally receive control information of a paging message and/or apaging message that are/is sent by a system, the system needs to enhancecoverage of the control information of a paging message and/or thepaging message. Neither an MME nor the eNodeB knows a channel losssituation between the terminal and the eNodeB, so that neither the MMEnor the eNodeB can determine to enhance coverage of control informationof a paging message and/or a paging message for which terminal, or knowa specific value of enhanced coverage that is required to enable theterminal to normally receive the control information of a paging messageand/or the paging message; therefore, the embodiment of the presentinvention provides a solution: Control information with enhancedcoverage and/or a second paging message with enhanced coverage are/issent to all terminals, and a specific value of enhanced coverage thatcan be provided is determined according to a worst channel loss status.In another aspect, the embodiment of the present invention furtherprovides another solution: Different specific values of enhancedcoverage are calculated according to different channel loss statuses, sothat a terminal needs to report channel loss information between theterminal and an eNodeB to a network device.

The eNodeB receives the channel loss information sent by the terminal.Specifically, the channel loss may include at least one of thefollowing: RSRP, RSRQ, a path loss, and a CQI, where the path loss is apath loss between the terminal and the eNodeB. In addition, the channelloss information that is sent by the terminal and received by the eNodeBmay be a value of the channel loss, or may be a range of a value of thechannel loss, or may be a range index of a value of the channel loss.For a detailed description about acquiring a value of a channel loss bythe terminal, reference may be made to a corresponding description instep 301 in the embodiment of the present invention, and details are notdescribed herein again in this embodiment of the present invention. Inaddition, after acquiring the value of the channel loss, the range ofthe value of the channel loss, or the range index of the value of thechannel loss between the terminal and the eNodeB, the terminal can sendthe obtained value of the channel loss, range of the value of thechannel loss, or range index of the value of the channel loss to theeNodeB by using a non-access stratum (NAS) message, where the NASmessage is transparent to the eNodeB. In this case, the eNodeB canreceive the channel loss information that is sent by the terminal byusing the NAS message, but does not parse the NAS message, where the NASmessage may be dedicated, or may be a message in an attach process, amessage in a tracking area update (TAU) process, or a message in anotherprocess. The terminal may also send the obtained value of the channelloss, range of the value of the channel loss, or range index of thevalue of the channel loss to the eNodeB by using one or more types ofthe following messages: an RRC message, a MAC CE message, and aphysical-layer message, so that the eNodeB can receive the channel lossinformation sent by the terminal, where the RRC message may be an RRCconnection request message (RRC connection request), and thephysical-layer message may be a random access preamble.

Optionally, before sending the channel loss information of the terminalto the eNodeB, the terminal may first determine whether the value of thechannel loss between the terminal and the eNodeB is greater than orequal to a set threshold; and reports the channel loss information ofthe terminal to the eNodeB when the value of the channel loss is greaterthan or equal to the set threshold, or does not report the channel lossinformation of the terminal to the eNodeB when the value of the channelloss is less than the set threshold.

402. The access network node sends the channel loss information of theterminal to a core network node.

After receiving the channel loss information of the terminal that issent by the terminal by using an NAS message, the eNodeB may onlyextract the NAS message from an RRC layer without processing content ofthe NAS message, and perform protocol conversion; then the eNodeB sendsthe received channel loss information of the terminal to the MME byusing a message at a protocol layer of the eNodeB and the MME.Alternatively, after receiving the channel loss information of theterminal that is sent by the terminal by using one or more types of thefollowing messages: an RRC message, a MAC CE message, and aphysical-layer message, the eNodeB may send the channel loss informationto the MME by using a message at a protocol layer of the eNodeB and theMME. The message at the protocol layer of the eNodeB and the MME may bea capacity information indication.

403. The core network node stores an IMSI or an S-TMSI of the terminalassociatively with the channel loss information of the terminal.

The foregoing core network node may be an MME.

After receiving the IMSI of the terminal and the channel lossinformation of the terminal that are sent by the eNodeB, the MME maystore the IMSI of the terminal associatively with the channel lossinformation of the terminal. In the prior art, the core network node mayallocate an S-TMSI to the terminal, so that in the embodiment of thepresent invention, after receiving the channel loss information of theterminal that is sent by the eNodeB, the MME may store the S-TMSI of theterminal associatively with the channel loss information of theterminal. For example, the MME may store the IMSI or the S-TMSI of theterminal associatively with the channel loss information of the terminalin a manner shown in Table 1, where, for example, the channel lossinformation is a range index of a value of a channel loss.

TABLE 1 Range index of a value of a channel loss Terminal identifier 1IMSI 1 or S-TMSI 1 2 IMSI 2 or S-TMSI 2 3 IMSI 3 or S-TMSI 3

It should be noted that, in the embodiment of the present invention, theIMSI or the S-TMSI of the terminal and the channel loss information ofthe terminal may be associatively stored specifically as shown in Table1, or the associative storage may be implemented in another manner andformat, which is not limited in the embodiment of the present invention.

404. The core network node determines, according to an IMSI or an S-TMSIof the terminal, that the channel loss information of the terminal isstored.

The MME may determine, according to an IMSI or an S-TMSI of theterminal, whether channel loss information that is of the terminal andcorresponding to the IMSI or the S-TMSI of the terminal is stored, andwhen determining that the channel loss information of the terminal isavailable, perform the following step 405 to step 407. Specifically, theMME may perform determining according to the associative storage betweenthe IMSI or the S-TMSI of the terminal and the channel loss informationof the terminal.

Optionally, after determining that the channel loss information of theterminal is stored, the core network node may further send the IMSI orthe S-TMSI of the terminal and the channel loss information of theterminal to the access network node by using one or more messages at aprotocol layer of the access network node and the core network node, sothat the access network node stores the IMSI or the S-TMSI of theterminal associatively with the channel loss information of theterminal. In this way, when the terminal is being paged, the corenetwork node sends a first paging message to the access network node ina form of sending a paging message. The access network node parses thefirst paging message to obtain the IMSI or the S-TMSI of the pagedterminal carried in the first paging message; obtains the channel lossinformation according to the IMSI or the S-TMSI from an associationrelationship that is between the IMSI or the S-TMSI of the terminal andthe channel loss information of the terminal and stored in the accessnetwork node; determines a transmission parameter according to thechannel loss information; and sends, according to the transmissionparameter, control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal that needs to bepaged by the core network node.

405. The core network node sends a first paging message that carries thechannel loss information to the access network side, or sends a firstpaging message and the channel loss information of the terminal to theaccess network node.

If the MME determines that the channel loss information of the terminalis available, the MME may send the first paging message to all eNodeBsin a tracking area of the MME, where the first paging message may carryat least one piece of the following information: channel lossinformation corresponding to the IMSI or the S-TMSI of the terminal thatneeds to be paged, an identity index value of the terminal, and the IMSIor the S-TMSI of the terminal. For example, information elements (IE)included in the first paging message that carries the channel lossinformation, the identity index value of the terminal, and the IMSI orthe S-TMSI of the terminal may be shown in Table 2, where the last IE isthe channel loss information. The MME may also separately send thechannel loss information of the terminal that needs to be paged and thefirst paging message to the eNodeB, where the channel loss informationof the terminal can be notified to the eNodeB by using a dedicatedmessage at the protocol layer of the eNodeB and the MME. If the MMEdetermines that the channel loss information of the terminal isunavailable, when the terminal is being paged, the MME only needs tosend the first paging message to the eNodeB according to the prior art.

TABLE 2 IE/Group name Group Name Message type Message Type UE Identityindex value UE Identity Index value UE paging identity UE PagingIdentity Paging discontinuous reception Paging DRX Core network domainCN Domain List of tracking area identities List of TAIs >Tracking areaidentity list item TAI List Item >>Tracking area identity TAI Closedsubscriber group identity list CSG Id List >Closed subscriber groupidentity CSG Id Paging priority Paging Priority Channel loss informationChannel loss Info

It should be noted that a form of notifying, by the core network node,the access network node of the channel loss information of the terminalthat needs to be paged is not limited in the embodiment of the presentinvention.

406. The access network node determines a transmission parameteraccording to the channel loss information of the terminal.

After receiving the first paging message that carries the channel lossinformation of the terminal or receiving the channel loss information ofthe terminal, the eNodeB may determine the transmission parameteraccording to the received channel loss information of the terminal,where the transmission parameter may be one or more of the following: astart frame number, a start subframe number, a start timeslot number, astart symbol number that are used for transmission of the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage, a number of the first resource block (RB), a numberof the first subcarrier occupied for transmission of the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage, a quantity of frames, a quantity of subframes, aquantity of timeslots, a quantity of symbols, a quantity of RBs, aquantity of subcarriers that are occupied for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage, a quantity of repeated times, aspreading factor, a spread spectrum sequence index, a size oftransmission time interval bundling (TTI) bundling, an aggregation levelthat are used for transmission of the control information with enhancedcoverage and/or the second paging message with enhanced coverage, powerconfiguration, a modulation and coding scheme, a cycle, a PF, and a POthat are used for transmission of the control information with enhancedcoverage and/or the second paging message with enhanced coverage.

Optionally, the access network node may determine the transmissionparameter according to Transmission parameter=fun(channel lossinformation), where fun( ) indicates a fixed function.

Optionally, the access network node may store a correspondencerelationship between the transmission parameter and the channel lossinformation. After receiving the first paging message that carries thechannel loss information of the terminal or receiving the channel lossinformation of the terminal, the access network node may search thestored correspondence relationship to determine the transmissionparameter. For example, when the channel loss information is a rangeindex of a value of the channel loss, and the transmission parameter isthe quantity of repeated times used by the control information withenhanced coverage or the quantity of repeated times used by the secondpaging message with enhanced coverage, the correspondence relationshipbetween the channel loss information and the transmission parameterwhich is pre-stored in the access network node may be shown in Table 3.After receiving the first paging message that carries the range index ofthe value of the channel loss of the terminal or receiving the rangeindex of the value of the channel loss of the terminal, the accessnetwork node may search Table 3 according to the received range index ofthe value of the channel loss of the terminal, so as to determine thequantity of repeated times.

TABLE 3 Quantity of repeated times of Range index of a controlinformation Quantity of repeated times of a value of a channel withenhanced second paging message with loss coverage enhanced coverage 1 x1y1 2 x2 y2 3 x3 y3

407. The access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal according to the transmission parameter.

The first paging message carries a terminal identity index value. Afterdetermining the transmission parameter, the eNodeB may send the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage to the terminal according to the transmissionparameter and the terminal identity index value, where the second pagingmessage carries the IMSI or the S-TMSI of the terminal.

Compared with control information without enhanced coverage, the controlinformation with enhanced coverage meets at least one of the followingconditions: more time domain resources are occupied for transmission ofthe control information with enhanced coverage compared withtransmission of the control information without enhanced coverage, morefrequency resources are occupied for transmission of the controlinformation with enhanced coverage compared with transmission of thecontrol information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission. Compared with a second pagingmessage without enhanced coverage, the second paging message withenhanced coverage meets at least one of the following conditions: moretime domain resources are occupied for transmission of the second pagingmessage with enhanced coverage compared with transmission of a secondpaging message without enhanced coverage, more frequency resources areoccupied for transmission of the second paging message with enhancedcoverage compared with transmission of the second paging message withoutenhanced coverage, transmit power for transmission of the second pagingmessage with enhanced coverage is higher than transmit power fortransmission of the second paging message without enhanced coverage, amodulation scheme used for transmission of the second paging messagewith enhanced coverage is more robust than a modulation scheme used fortransmission of the second paging message without enhanced coverage, acoding mode used for transmission of the second paging message withenhanced coverage is more robust than a coding mode used fortransmission of the second paging message without enhanced coverage, andbits of the second paging message with enhanced coverage in atransmission are fewer than bits of the second paging message withoutenhanced coverage in a transmission. Therefore, when a channel lossbetween the terminal and the access network node is relatively severe, amanner of sending the control information with enhanced coverage and/orthe second paging message with enhanced coverage to the terminal may beused to ensure that the terminal successfully receives a paging messagefrom a system.

Optionally, in a possible implementation manner, the eNodeB sendscontrol information of the second paging message with enhanced coverageaccording to the terminal identity index value and the transmissionparameter. For example, the control information of the second pagingmessage with enhanced coverage is carried through a physical downlinkcontrol channel (PDCCH) and/or an enhanced physical downlink controlchannel (ePDCCH), and cyclic redundancy check (CRC) of the controlinformation is scrambled by using a paging-radio network temporaryidentifier (P-RNTI); and a corresponding second paging message withenhanced coverage is scheduled by using the control message, so as tosend the second paging message with enhanced coverage through a physicaldownlink shared channel (PDSCH) according to transmission parameter. Inthis way, the terminal may listen on the PDCCH and/or the ePDCCH channelaccording to the IMSI of the terminal and the transmission parameterthat is determined according to the channel loss information of theterminal; descramble CRC of the PDCCH and/or the ePDCCH by using theP-RNTI; and check the control information with enhanced coverage byusing the CRC, so as to determine whether the control information withenhanced coverage of the terminal is available. If the controlinformation with enhanced coverage of the terminal is available, theterminal reads a corresponding second paging message with enhancedcoverage according to the scheduling of the control information and thetransmission parameter, and determines, according to an IMSI or anS-TMSI of a terminal that is carried in the second paging message withenhanced coverage, whether the second paging message is a paging messagefor the terminal itself. If the first paging message received by theeNodeB does not carry the channel loss information of the terminal, oronly the first paging message sent by the MME is received, but thechannel loss information of the terminal is not received, the eNodeBsends the control information of the second paging message and thesecond paging message to the terminal according to the prior art. Inthis case, the terminal only needs to calculate a corresponding PF andPO according to the IMSI of the terminal, and receive, over the PF andat the PO, the control information of the second paging message and thesecond paging message.

According to the paging optimization method provided in the embodimentof the present invention, when a terminal needs to be paged, a corenetwork node sends a first paging message to an access network node;after receiving the first paging message sent by the core network node,the access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

The terminal may report in advance channel loss information between theterminal and the access network node to the system, so that the systemcan acquire a transmission parameter of the terminal according to thechannel loss information of the terminal, and then send the controlinformation with enhanced coverage and/or a paging message with enhancedcoverage according to the transmission parameter of the terminal, whichsaves network resources.

Another embodiment of the present invention provides a pagingoptimization method. As shown in FIG. 5, the method may include:

501. An access network node receives an IMSI or an S-TMSI that is sentby a terminal, and receives channel loss information sent by theterminal; or receives an IMSI or an S-TMSI of a terminal sent by a corenetwork node, and receives channel loss information of the terminal sentby the core network node; or receives channel loss information sent by aterminal and an S-TMSI of the terminal sent by a core network node.

The foregoing access network node may be a base station and further maybe an eNodeB.

To ensure that, in a case in which a channel loss between the terminaland the eNodeB is severe, the terminal can still normally receive apaging message sent by a system, and that the eNodeB can send differentcontrol information with enhanced coverage and/or different secondpaging messages with enhanced coverage according to different channellosses between the terminal and the eNodeB, the terminal may report thechannel loss information between the terminal and the eNodeB to theeNodeB, so that the eNodeB can obtain a channel loss status between theterminal and the eNodeB. Specifically, the terminal may send the channelloss information to the eNodeB by using one or more types of thefollowing messages: an RRC message, a MAC CE message, and aphysical-layer message, where the RRC message may be an RRC connectionrequest message (RRC connection request), and the physical-layer messagemay be a random access preamble. The terminal may send, to the eNodeB byusing an access stratum (AS) message, the IMSI of the terminal or theS-TMSI allocated to the terminal by the core network node, where theaccess stratum message may be an RRC Connection Request. In this case,the eNodeB can receive the IMSI or the S-TMSI sent by the terminal andthe channel loss information sent by the terminal.

Optionally, before sending the IMSI or the S-TMSI of the terminal to theeNodeB, the terminal may first determine whether a value of the channelloss between the terminal and the eNodeB is greater than or equal to aset threshold; and reports the channel loss information of the terminaland the IMSI or the S-TMSI of the terminal to the eNodeB when the valueof the channel loss is greater than or equal to the set threshold, ordoes not report the channel loss information of the terminal to theeNodeB when the value of the channel loss is less than the setthreshold. In a case in which the value of the channel loss is equal tothe set threshold, whether to report the channel loss information may bedetermined according to an actual network condition, which is notlimited in the embodiment of the present invention.

Optionally, the terminal may send the channel loss information to theeNodeB in the foregoing manner; and the core network node may allocatethe S-TMSI to the terminal, and send the allocated S-TMSI to the eNodeBby using a message at a protocol layer of an MME and the eNodeB. In thiscase, the eNodeB can receive the channel loss information sent by theterminal and the S-TMSI of the terminal sent by the MME.

Optionally, the embodiment of the present invention may further includestep 401 to step 404. Further, if the MME determines that the channelloss information of the terminal is stored, the MME may send the IMSI orthe S-TMSI of the terminal and the channel loss information of theterminal to the eNodeB by using a message at the protocol layer of theMME and the eNodeB. In this case, the eNodeB can receive the IMSI or theS-TMSI of the terminal and the channel loss information of the terminalthat are sent by the MME.

502. The access network node stores the IMSI or the S-TMSI of theterminal associatively with the channel loss information of theterminal.

After the eNodeB receives the IMSI or the S-TMSI sent by the terminaland the channel loss information sent by the terminal, or after theeNodeB receives the IMSI or the S-TMSI of the terminal sent by the MMEand the channel loss information of the terminal sent by the MME, orafter the eNodeB receives the channel loss information sent by theterminal and the S-TMSI of the terminal sent by the MME, the eNodeB maystore the received IMSI or S-TMSI of the terminal associatively with thechannel loss information of the terminal. For a specific storage format,reference may be made to the manner in which the MME stores the IMSI orthe S-TMSI of the terminal and the channel loss information of theterminal in step 403, and details are not described herein again in theembodiment of the present invention.

503. The access network node receives a first paging message sent by thecore network node.

When the system needs to page the terminal, the MME that serves theterminal may send the first paging message to all eNodeBs in a trackingarea.

504. The access network node determines, according to an IMSI or anS-TMSI of the terminal, that the channel loss information of theterminal is stored.

After the eNodeB receives the first paging message sent by the MME, theaccess network node may determine, according to an IMSI or an S-TMSI ofthe terminal carried in the first paging message, whether the channelloss information corresponding to the IMSI or the S-TMSI of the terminalis stored; and after determining that the channel loss information ofthe terminal is stored, perform the following step 505 to step 506.

505. The access network node determines a transmission parameteraccording to the channel loss information of the terminal.

When the eNodeB determines that the channel loss informationcorresponding to the IMSI or the S-TMSI of the terminal carried in thefirst paging message, the eNodeB may determine the transmissionparameter according to the channel loss information of the terminal.

506. The access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal according to the transmission parameter.

The first paging message carries a terminal identity index value of theterminal that needs to be paged. In this case, after the eNodeB receivesthe first paging message sent by the MME, and after the eNodeBdetermines the transmission parameter according to the channel lossinformation of the terminal, the eNodeB may send the control informationwith enhanced coverage and/or the second paging message with enhancedcoverage to the terminal according to the terminal identity index value,the transmission parameter, a paging frame, and a paging occasion. Inthis way, the terminal may receive the control information with enhancedcoverage and/or the second paging message with enhanced coverageaccording to the transmission parameter that is determined according tothe channel loss information of the terminal. If the eNodeB determines,after receiving the first paging message sent by the MME, that thechannel loss information corresponding to the IMSI or the S-TMSI of theterminal carried in the first paging message is unavailable, the eNodeBmay only send control information of the second paging message and/orthe second paging message according to the prior art.

It should be noted that, for a specific description of a parameter instep 501 to step 506, reference may be made to the specific descriptionabout a corresponding parameter in step 401 to step 407, and details arenot described herein again in the embodiment of the present invention.

According to the paging optimization method provided in the embodimentof the present invention, when a terminal needs to be paged, a corenetwork node sends a first paging message to an access network node;after receiving the first paging message sent by the core network node,the access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

In addition, the terminal may report in advance channel loss informationbetween the terminal and the access network node to the system, so thatthe system can acquire a transmission parameter of the terminalaccording to the channel loss information of the terminal, and then sendthe control information with enhanced coverage and/or a paging messagewith enhanced coverage according to the transmission parameter of theterminal, which saves network resources.

Another embodiment of the present invention provides an access networknode. As shown in FIG. 6, the access network node includes: a firstreceiving unit 61 and a first sending unit 62.

The first receiving unit 61 is configured to receive a first pagingmessage sent by a core network node, where the first paging message isused to page a terminal.

The first sending unit 62 is configured to send control information withenhanced coverage and/or a second paging message with enhanced coverageto the terminal in response to the first paging message.

Further, the first paging message includes channel loss information ofthe terminal.

The access network node may further include: a second receiving unit 63.

The second receiving unit 63 is configured to, before the first sendingunit 62 sends control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal in response to thefirst paging message, receive channel loss information of the terminalsent by the core network node.

Further, the access network node may further include: a third receivingunit 64 and a second sending unit 65.

The third receiving unit 64 is configured to, before the first receivingunit 61 receives the first paging message sent by the core network node,receive channel loss information sent by the terminal.

The second sending unit 65 is configured to send the channel lossinformation of the terminal received by the third receiving unit 64 tothe core network node.

Further, the access network node may further include: a fourth receivingunit 66 and a storage unit 67.

The fourth receiving unit 66 is configured to receive an internationalmobile subscriber identity IMSI or a temporary mobile subscriberidentity S-TMSI that is sent by the terminal, and receive channel lossinformation sent by the terminal; or, receive an IMSI or an S-TMSI ofthe terminal sent by the core network node, and receive channel lossinformation of the terminal sent by the core network node; or, receivechannel loss information sent by the terminal and an S-TMSI of theterminal sent by the core network node.

The storage unit 67 is configured to store, associatively with thechannel loss information of the terminal, the IMSI or the S-TMSI of theterminal received by the fourth receiving unit 66.

Further, the access network node may further include: a determining unit68.

The determining unit 68 is configured to, before the first sending unit62 sends control information with enhanced coverage and/or a secondpaging message with enhanced coverage to the terminal in response to thefirst paging message, determine, according to an IMSI or an S-TMSI ofthe terminal, that the channel loss information of the terminal isstored.

Further, the first sending unit 62 may include: a determining module 621and a sending module 622.

The determining module 621 is configured to determine a transmissionparameter according to the channel loss information of the terminal.

The sending module 622 is configured to send the control informationwith enhanced coverage and/or the second paging message with enhancedcoverage to the terminal according to the transmission parameterdetermined by the determining module 621.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the transmission parameter includes at least one of thefollowing: a start frame number, a start subframe number, a starttimeslot number, a start symbol number, a number of the first resourceblock RB, a number of the first subcarrier, a quantity of frames, aquantity of subframes, a quantity of timeslots, a quantity of symbols, aquantity of RBs, a quantity of subcarriers, a quantity of repeatedtimes, a spreading factor, a spread spectrum sequence index, a size oftransmission time interval bundling TTI bundling, an aggregation level,power configuration, a modulation and coding scheme, a cycle, a pagingframe PF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

Further, the channel loss information includes a value of a channelloss, or a range of a value of a channel loss, or a range index of avalue of a channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

For another function and structure of the access network node, referencemay be made to the foregoing method embodiments.

According to the access network node provided in the embodiment of thepresent invention, when a terminal needs to be paged, a core networknode sends a first paging message to the access network node; afterreceiving the first paging message sent by the core network node, theaccess network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

The terminal may report in advance channel loss information between theterminal and the access network node to the system, so that the systemcan acquire a transmission parameter of the terminal according to thechannel loss information of the terminal, and then send the controlinformation with enhanced coverage and/or a paging message with enhancedcoverage according to the transmission parameter of the terminal, whichsaves network resources.

Another embodiment of the present invention provides a core networknode. As shown in FIG. 7, the core network node includes: a determiningunit 71, and a first sending unit 72 or a second sending unit 73.

The determining unit 71 is configured to determine, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of a terminal, that channel loss informationof the terminal is stored.

The first sending unit 72 is configured to send a first paging messagethat carries the channel loss information to an access network node, sothat the access network node sends control information with enhancedcoverage and/or a second paging message with enhanced coverage to theterminal according to the first paging message; or

the second sending unit 73 is configured to send a first paging messageand the channel loss information of the terminal to an access networknode, so that the access network node sends control information withenhanced coverage and/or a second paging message with enhanced coverageto the terminal according to the first paging message and the channelloss information of the terminal.

Further, as shown in FIG. 8, the core network node may further include:a third sending unit 74.

The third sending unit 74 is configured to send the IMSI or the S-TMSIof the terminal to the access network node, and send the channel lossinformation of the terminal to the access network node, so that theaccess network device stores the IMSI or the S-TMSI of the terminalassociatively with the channel loss information of the terminal.

Further, the core network node may further include: a receiving unit 75and a storage unit 76.

The receiving unit 75 is configured to receive the channel lossinformation of the terminal before the determining unit 71 determines,according to the international mobile subscriber identity IMSI or thetemporary mobile subscriber identity S-TMSI of the terminal, that thechannel loss information of the terminal is stored.

The storage unit 76 is configured to store, associatively with the IMSIor the S-TMSI of the terminal, the channel loss information of theterminal received by the receiving unit 75.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the channel loss information includes a value of a channelloss, or a range of a value of a channel loss, or a range index of avalue of a channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

According to the core network node provided in the embodiment of thepresent invention, when a terminal needs to be paged, the core networknode sends a first paging message to an access network node; afterreceiving the first paging message sent by the core network node, theaccess network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

In addition, the terminal may report in advance channel loss informationbetween the terminal and the access network node to the system, so thatthe system can acquire a transmission parameter of the terminalaccording to the channel loss information of the terminal, and then sendthe control information with enhanced coverage and/or a paging messagewith enhanced coverage according to the transmission parameter of theterminal, which saves network resources.

Another embodiment of the present invention provides a terminal. Asshown in FIG. 9, the terminal includes: a first determining unit 81, asending and determining unit 82, and a receiving unit 83.

The first determining unit 81 is configured to determine channel lossinformation between the terminal and an access network node.

The sending and determining unit 82 is configured to send the channelloss information to the access network node, send an internationalmobile subscriber identity IMSI or a temporary mobile subscriberidentity S-TMSI to the access network node, and determine a transmissionparameter according to the channel loss information.

The receiving unit 83 is configured to receive, according to thetransmission parameter determined by the sending and determining unit82, control information with enhanced coverage and/or a second pagingmessage with enhanced coverage that are/is sent by the access networknode.

Further, the terminal may further include: a second determining unit 84.

The second determining unit 84 is configured to, before the sending anddetermining unit 82 sends the channel loss information to the accessnetwork node, sends the international mobile subscriber identity IMSI orthe temporary mobile subscriber identity S-TMSI to the access networknode, and determines the transmission parameter according to the channelloss information, determine that the channel loss information meets aset condition, where the set condition includes that a value of thechannel loss is greater than or equal to a set threshold.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the transmission parameter includes at least one of thefollowing: a start frame number, a start subframe number, a starttimeslot number, a start symbol number, a number of the first resourceblock RB, a number of the first subcarrier, a quantity of frames, aquantity of subframes, a quantity of timeslots, a quantity of symbols, aquantity of RBs, a quantity of subcarriers, a quantity of repeatedtimes, a spreading factor, a spread spectrum sequence index, a size oftransmission time interval bundling TTI bundling, an aggregation level,power configuration, a modulation and coding scheme, a cycle, a pagingframe PF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

Further, the channel loss information includes the value of the channelloss, or a range of the value of the channel loss, or a range index ofthe value of the channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

According to the terminal provided in the embodiment of the presentinvention, the terminal sends channel loss information to an accessnetwork node, and sends an IMSI or an S-TMSI to the access network node,so that when the terminal is being paged, the access network node cansend control information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal, and the terminal canreceive, according to a transmission parameter that is determinedaccording to the channel loss information, the control information withenhanced coverage and/or the second paging message with enhancedcoverage that are/is sent by the access network node. This effectivelyensures that, in a case in which a channel loss between the terminal andthe access network node is severe, the terminal can still normallyreceive a paging message sent by a system.

In addition, the terminal may report in advance the channel lossinformation between the terminal and the access network node to thesystem, so that the system can acquire the transmission parameter of theterminal according to the channel loss information of the terminal, andthen send the control information with enhanced coverage and/or a pagingmessage with enhanced coverage according to the transmission parameterof the terminal, which saves network resources.

Another embodiment of the present invention provides an access networknode. As shown in FIG. 10, the access network node includes: at leastone processor 91, a receiver 92, and a transmitter 93.

The receiver 92 is configured to receive a first paging message sent bya core network node, where the first paging message is used to page aterminal.

The processor 91 is configured to process the first paging messagereceived by the receiver 92, and trigger the transmitter 93 to respondto the first paging message.

The transmitter 93 is configured to send control information withenhanced coverage and/or a second paging message with enhanced coverageto the terminal in response to the first paging message.

Further, the first paging message includes channel loss information ofthe terminal; or

the receiver 92 is further configured to, before the transmitter sendscontrol information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal in response to the firstpaging message, receive channel loss information of the terminal sent bythe core network node.

Further, the receiver 92 is further configured to, before receiving thefirst paging message sent by the core network node, receive channel lossinformation sent by the terminal.

The transmitter 93 is further configured to send the channel lossinformation of the terminal to the core network node.

Further, the access network node may further include: a memory 94.

The receiver 92 is further configured to receive an international mobilesubscriber identity IMSI or a temporary mobile subscriber identityS-TMSI that is sent by the terminal, and receive channel lossinformation sent by the terminal; or, receive an IMSI or an S-TMSI ofthe terminal sent by the core network node, and receive channel lossinformation of the terminal sent by the core network node; or, receivechannel loss information sent by the terminal and an S-TMSI of theterminal sent by the core network node.

The memory 94 is configured to store the IMSI or the S-TMSI of theterminal associatively with the channel loss information of theterminal.

Further, the processor 91 is further configured to, before processingthe first paging message received by the receiver 92, and triggering thetransmitter 93 to respond to the first paging message, determine,according to an IMSI or an S-TMSI of the terminal, that the channel lossinformation of the terminal is stored.

Further, the processor 91 is further configured to determine atransmission parameter according to the channel loss information of theterminal.

The transmitter 93 is further configured to send the control informationwith enhanced coverage and/or the second paging message with enhancedcoverage to the terminal according to the transmission parameter.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the transmission parameter includes at least one of thefollowing: a start frame number, a start subframe number, a starttimeslot number, a start symbol number, a number of the first resourceblock RB, a number of the first subcarrier, a quantity of frames, aquantity of subframes, a quantity of timeslots, a quantity of symbols, aquantity of RBs, a quantity of subcarriers, a quantity of repeatedtimes, a spreading factor, a spread spectrum sequence index, a size oftransmission time interval bundling TTI bundling, an aggregation level,power configuration, a modulation and coding scheme, a cycle, a pagingframe PF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

Further, the channel loss information includes a value of a channelloss, or a range of a value of a channel loss, or a range index of avalue of a channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

According to the access network node provided in the embodiment of thepresent invention, when a terminal needs to be paged, a core networknode sends a first paging message to the access network node; afterreceiving the first paging message sent by the core network node, theaccess network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

In addition, the terminal may report in advance channel loss informationbetween the terminal and the access network node to the system, so thatthe system can acquire a transmission parameter of the terminalaccording to the channel loss information of the terminal, and then sendthe control information with enhanced coverage and/or a paging messagewith enhanced coverage according to the transmission parameter of theterminal, which saves network resources.

Another embodiment of the present invention provides a core networknode. As shown in FIG. 11, the core network node includes: at least oneprocessor 1001 and a transmitter 1002.

The processor 1001 is configured to determine, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of a terminal, that channel loss informationof the terminal is stored.

The transmitter 1002 is configured to send a first paging message thatcarries the channel loss information to an access network node, so thatthe access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalaccording to the first paging message; or,

the transmitter 1002 is further configured to send a first pagingmessage and the channel loss information of the terminal to an accessnetwork node, so that the access network node sends control informationwith enhanced coverage and/or a second paging message with enhancedcoverage to the terminal according to the first paging message and thechannel loss information of the terminal.

Further, the transmitter 1002 is further configured to send the IMSI orthe S-TMSI of the terminal to the access network node, and send thechannel loss information of the terminal to the access network node, sothat the access network node stores the IMSI or the S-TMSI of theterminal associatively with the channel loss information of theterminal.

Further, the core network node may further include: a receiver 1003 anda memory 1004.

The receiver 1003 is configured to, before the determining, according toan international mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of a terminal, that channel loss informationof the terminal is stored, receive the channel loss information of theterminal.

The memory 1004 is configured to store the channel loss information ofthe terminal associatively with the IMSI or the S-TMSI of the terminal.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the channel loss information includes a value of a channelloss, or a range of a value of a channel loss, or a range index of avalue of a channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

According to the core network node provided in the embodiment of thepresent invention, when a terminal needs to be paged, the core networknode sends a first paging message to an access network node; afterreceiving the first paging message sent by the core network node, theaccess network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

In addition, the terminal may report in advance channel loss informationbetween the terminal and the access network node to the system, so thatthe system can acquire a transmission parameter of the terminalaccording to the channel loss information of the terminal, and then sendthe control information with enhanced coverage and/or a paging messagewith enhanced coverage according to the transmission parameter of theterminal, which saves network resources.

Another embodiment of the present invention provides a terminal. Asshown in FIG. 12, the terminal includes: at least one processor 1101, areceiver 1102, and a transmitter 1103.

The processor 1101 is configured to determine channel loss informationbetween the terminal and an access network node.

The processor 1101 is further configured to trigger the transmitter 1103to: send the channel loss information to the access network node, andsend an international mobile subscriber identity IMSI or a temporarymobile subscriber identity S-TMSI to the access network node; and isfurther configured to determine a transmission parameter according tothe channel loss information.

The receiver 1102 is configured to receive, according to thetransmission parameter, control information with enhanced coverageand/or a second paging message with enhanced coverage that are/is sentby the access network node.

Further, the processor 1101 is further configured to, before the sendingthe channel loss information to the access network node, and sending aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI to the access network node, determine thatthe channel loss information meets a set condition, where the setcondition includes that a value of the channel loss is greater than orequal to a set threshold.

Further, the control information with enhanced coverage meets at leastone of the following conditions: more time domain resources are occupiedfor transmission of the control information with enhanced coveragecompared with transmission of control information without enhancedcoverage, more frequency resources are occupied for transmission of thecontrol information with enhanced coverage compared with transmission ofthe control information without enhanced coverage, transmit power fortransmission of the control information with enhanced coverage is higherthan transmit power for transmission of the control information withoutenhanced coverage, a modulation scheme used for transmission of thecontrol information with enhanced coverage is more robust than amodulation scheme used for transmission of the control informationwithout enhanced coverage, a coding mode used for transmission of thecontrol information with enhanced coverage is more robust than a codingmode used for transmission of the control information without enhancedcoverage, and bits of the control information with enhanced coverage ina transmission are fewer than bits of the control information withoutenhanced coverage in a transmission; and

the second paging message with enhanced coverage meets at least one ofthe following conditions: more time domain resources are occupied fortransmission of the second paging message with enhanced coveragecompared with transmission of a second paging message without enhancedcoverage, more frequency resources are occupied for transmission of thesecond paging message with enhanced coverage compared with transmissionof the second paging message without enhanced coverage, transmit powerfor transmission of the second paging message with enhanced coverage ishigher than transmit power for transmission of the second paging messagewithout enhanced coverage, a modulation scheme used for transmission ofthe second paging message with enhanced coverage is more robust than amodulation scheme used for transmission of the second paging messagewithout enhanced coverage, a coding mode used for transmission of thesecond paging message with enhanced coverage is more robust than acoding mode used for transmission of the second paging message withoutenhanced coverage, and bits of the second paging message with enhancedcoverage in a transmission are fewer than bits of the second pagingmessage without enhanced coverage in a transmission.

Further, the transmission parameter includes at least one of thefollowing: a start frame number, a start subframe number, a starttimeslot number, a start symbol number, a number of the first resourceblock RB, a number of the first subcarrier, a quantity of frames, aquantity of subframes, a quantity of timeslots, a quantity of symbols, aquantity of RBs, a quantity of subcarriers, a quantity of repeatedtimes, a spreading factor, a spread spectrum sequence index, a size oftransmission time interval bundling TTI bundling, an aggregation level,power configuration, a modulation and coding scheme, a cycle, a pagingframe PF, and a paging occasion PO that are used for transmission of thecontrol information with enhanced coverage and/or the second pagingmessage with enhanced coverage.

Further, the channel loss information includes the value of the channelloss, or a range of the value of the channel loss, or a range index ofthe value of the channel loss.

Further, the channel loss includes at least one of the following:reference signal received power RSRP, reference signal received qualityRSRQ, a path loss, and a channel quality indication CQI.

According to the terminal provided in the embodiment of the presentinvention, the terminal sends channel loss information to an accessnetwork node, and sends an IMSI or an S-TMSI to the access network node,so that when the terminal is being paged, the access network node cansend control information with enhanced coverage and/or a second pagingmessage with enhanced coverage to the terminal, and the terminal canreceive, according to a transmission parameter that is determinedaccording to the channel loss information, the control information withenhanced coverage and/or the second paging message with enhancedcoverage that are/is sent by the access network node. This effectivelyensures that, in a case in which a channel loss between the terminal andthe access network node is severe, the terminal can still normallyreceive a paging message sent by a system.

In addition, the terminal may report in advance the channel lossinformation between the terminal and the access network node to thesystem, so that the system can acquire the transmission parameter of theterminal according to the channel loss information of the terminal, andthen send the control information with enhanced coverage and/or a pagingmessage with enhanced coverage according to the transmission parameterof the terminal, which saves network resources.

Another embodiment of the present invention provides a pagingoptimization system. As shown in FIG. 13, the paging optimization systemincludes: an access network node 1201, a core network node 1202, and aterminal 1203.

The access network node 1201 is configured to receive a first pagingmessage sent by the core network node 1202, where the first pagingmessage is used to page the terminal 1203; and send control informationwith enhanced coverage and/or a second paging message with enhancedcoverage to the terminal 1203 in response to the first paging message.

The core network node 1202 is configured to determine, according to aninternational mobile subscriber identity IMSI or a temporary mobilesubscriber identity S-TMSI of the terminal 1203, that channel lossinformation of the terminal 1203 is stored; and send the first pagingmessage that carries the channel loss information to the access networknode 1201, so that the access network node 1201 sends the controlinformation with enhanced coverage and/or the second paging message withenhanced coverage to the terminal 1203 according to the first pagingmessage; or, send the first paging message and the channel lossinformation of the terminal 1203 to the access network node 1201, sothat the access network node 1201 sends the control information withenhanced coverage and/or the second paging message with enhancedcoverage to the terminal 1203 according to the first paging message andthe channel loss information of the terminal 1203.

The terminal 1203 is configured to send the channel loss information tothe access network node 1201, and send the international mobilesubscriber identity IMSI or the temporary mobile subscriber identityS-TMSI to the access network node 1201; determine a transmissionparameter according to the channel loss information; and receive,according to the transmission parameter, the control information withenhanced coverage and/or the second paging message with enhancedcoverage that are/is sent by the access network node 1201.

According to the paging optimization system provided in the embodimentof the present invention, when a terminal needs to be paged, a corenetwork node sends a first paging message to an access network node;after receiving the first paging message sent by the core network node,the access network node sends control information with enhanced coverageand/or a second paging message with enhanced coverage to the terminalthat needs to be paged. This effectively ensures that, in a case inwhich a channel loss between the terminal and the access network node issevere, the terminal can still normally receive a paging message sent bya system.

In addition, the terminal may report in advance channel loss informationbetween the terminal and the access network node to the system, so thatthe system can acquire a transmission parameter of the terminalaccording to the channel loss information of the terminal, and then sendthe control information with enhanced coverage and/or a paging messagewith enhanced coverage according to the transmission parameter of theterminal, which saves network resources.

Based on the foregoing descriptions of the implementation manners, aperson skilled in the art may clearly understand that the presentinvention may be implemented by software in addition to necessaryuniversal hardware or by hardware only. In most circumstances, theformer is a preferred implementation manner. Based on such anunderstanding, the technical solutions of the present inventionessentially or the part contributing to the prior art may be implementedin a form of a software product. The software product is stored in areadable storage medium, such as a floppy disk, a hard disk or anoptical disc of a computer, and includes several instructions forinstructing a computer device (which may be a personal computer, aserver, or a network device) to perform the methods described in theembodiments of the present invention.

The foregoing descriptions are merely specific embodiments of thepresent invention, but are not intended to limit the protection scope ofthe present invention. Any variation or replacement readily figured outby a person skilled in the art within the technical scope disclosed inthe present invention shall fall within the protection scope of thepresent invention. Therefore, the protection scope of the presentinvention shall be subject to the protection scope of the claims.

The invention claimed is:
 1. A paging method, comprising: determining,by a core network node, channel loss information of a terminal accordingto an international mobile subscriber identity (IMSI) or a temporarymobile subscriber identity (S-TMSI) of the terminal; sending, by thecore network node, a first paging message that carries the channel lossinformation to an access network node, wherein the first paging messageis used to page the terminal; and in response to the first pagingmessage, sending, by the access network node, control information withenhanced coverage to the terminal, the channel loss information isassociated with a transmission parameter, and the transmission parametercomprises a quantity of repeated times used for transmission of thecontrol information with enhanced coverage.
 2. The method according toclaim 1, wherein the transmission parameter is further used fortransmission of a second paging message with enhanced coverage.
 3. Themethod according to claim 1, wherein the transmission parametercomprises a quantity of repeated times used for transmission of a secondpaging message with enhanced coverage.
 4. The method according to claim1, further comprising: receiving, by the core network node, the channelloss information of the terminal; and storing, by the core network node,the channel loss information of the terminal.
 5. The method according toclaim 1, wherein more time domain resources are occupied fortransmission of the control information with enhanced coverage comparedwith transmission of control information without enhanced coverage, orbits of the control information with enhanced coverage in a transmissionare fewer than bits of the control information without enhanced coveragein a transmission.
 6. The method according to claim 1, wherein thechannel loss information comprises a range index of a value of a channelloss.
 7. The method according to claim 1, wherein the channel losscomprises a channel quality indication.
 8. The method according to claim2, wherein the channel loss information is a range index of a value of achannel loss, and the transmission parameter is a quantity of repeatedtimes for transmission of the control information with enhancedcoverage.
 9. The method according to claim 1, wherein the controlinformation with enhanced coverage is used to schedule a second pagingmessage with enhanced coverage.
 10. The method according to 1, themethod further comprising: receiving, by the access network node, thechannel loss information from the terminal; and sending, by the accessnetwork node, the channel loss information of the terminal to the corenetwork node.
 11. The method according to claim 1, wherein more timedomain resources are occupied for transmission of the second pagingmessage with enhanced coverage compared with transmission of a secondpaging message without enhanced coverage, or bits of the second pagingmessage with enhanced coverage in a transmission are fewer than bits ofthe second paging message without enhanced coverage in a transmission.12. An apparatus, comprising: a memory storing program instructions; anda processor coupled to the memory, wherein the program instructions,when executed by the processor, cause the apparatus to: determinechannel loss information of a terminal according to an internationalmobile subscriber identity (IMSI) or a temporary mobile subscriberidentity (S-TMSI) of the terminal; and send a first paging message thatcarries the channel loss information to an access network node, whereinthe first paging message is used to page the terminal, the channel lossinformation is associated with a transmission parameter, and thetransmission parameter comprises a quantity of repeated times used fortransmission of control information with enhanced coverage.
 13. Theapparatus according to claim 12, wherein the transmission parameter isfurther used for transmission of a second paging message with enhancedcoverage.
 14. The apparatus according to claim 12, wherein thetransmission parameter comprises a quantity of repeated times used fortransmission of a second paging message with enhanced coverage.
 15. Theapparatus according to claim 12, wherein the program instructions, whenexecuted by the processor, further cause the apparatus to: receive thechannel loss information of the terminal; and store the channel lossinformation of the terminal.
 16. The apparatus according to claim 12,wherein the apparatus is a mobile management entity.
 17. The apparatusaccording to claim 12, wherein the channel loss information is a rangeindex of a value of a channel loss, and the transmission parameter is aquantity of repeated times used by the control information with enhancedcoverage.
 18. A communication system, comprising a core network node andan access network node, wherein: the core network node is configured todetermine channel loss information of a terminal according to aninternational mobile subscriber identity (IMSI) or a temporary mobilesubscriber identity (S-TMSI) of the terminal, and send a first pagingmessage that carries the channel loss information to an access networknode, wherein the first paging message is used to page the terminal; andthe access network node is configured to, in response to the firstpaging message, send control information with enhanced coverage to theterminal, wherein the channel loss information is associated with atransmission parameter, and the transmission parameter comprises aquantity of repeated times used for transmission of the controlinformation with enhanced coverage.
 19. The system according to claim18, wherein the control information with enhanced coverage is used toschedule a second paging message with enhanced coverage.
 20. The methsystem od according to 18, wherein the access network node is furtherconfigured to: receive the channel loss information from the terminal;and send the channel loss information of the terminal to the corenetwork node.